题目内容

Flag () is used to indicate carry out in unsigned arithmetic operations. ( )

AC
B. OV
CY
D. P

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The contents of accumulator and CY are BAH and 0 respectively. After execution of instruction “SUBB A, #64H”, the status of CY and OV flags will be ( )

A. (CY)=0, (OV)=0
B. (CY)=0, (OV)=1
C. (CY)=1, (OV)=0
D. (CY)=1, (OV)=1

The contents of accumulator and CY are 65H and 0 respectively. After execution of instruction “SUBB A, #78H”, the contents of A will be( )

A. EDH
B. DEH
C. 19H
D. 78H

The contents of accumulator, R0 and RAM location 30H are F0H, 30H, and AAH respectively. After execution of an instruction “XCH A, @R0”, the contents of A will be( )

AAH
B. F0H
C. 30H
D. 78H

The contents of accumulator, R1 and RAM location 40H are F0H, 40H, and 0FH respectively. After execution of an instruction “XCHD A, @R1”, the contents of A will be( )

A. 00H
B. F0H
C. 0FH
D. FFH